Address error on 30F3011

[gpaolo79]

Hello!
I'm experiencing serious problems with the software I'm writing for a 30F3011 dsPIC.
In particular, even disabling interrupt nesting, my PIC still resetting itself with the ADDRERR exception. The problem appears when I try to use Timer1, 4 and 5 with a short interval between each interrupt.
In particular, I have a printf in timer1 interrupt handle and two PWM routines in timer 4 and 5. Except for the printf routine, there are few instructions in each interrupt handles, but I'm quite sure that that the problem is in the time taken by the printf to perform the write on the serial port.
So, I have timer1 configured to give an interrupt every 0.85 sec and the printf has to transmit more or less 120 characters @38400bps; if I set the timer 4 and 5 with a long period -more than 0.5msec-, I get no problem at all.
When the period begins to be short (in my case, when I want to update the PWM often, about 0.3msec) I begin to get garbage character on serial port even with the DISABLE_INT command in the #use rs232 directive, and when the period is *really* short -less than 0.3msec- the PIC "panics" and resets itself entering in the ADDRERR trap.
Setting interrupts priorities had no effect...
Do you have any idea about how to solve this problem?
Well, of course, sorry for my english, I hope that my problem is clear enough!

[rnielsen]

First of all, one thing about interrupts, they should be short and sweet.

You stated that you 'only' have one printf in your interrupt. Never _ever_ place a printf in an interrupt. Printf generates a ton of code and your processor will puke. Interrupts should contain as little code as possible. Something like setting a few flags or variables and then exit. Don't do any interrupt_enable() or interrupt_disable() commands inside and interrupt either.

Without seeing any code it's hard to know what else there might need to be changed.

Ronald

[gpaolo79]